antigen
UK[ˈæntɪdʒən]US[ˈæntɪdʒən]
n
a substance that causes the body's immune system to produce antibodies to fight it, especially one that causes an allergic reaction.
n
any substance that can stimulate an immune response.
Morpheme Breakdown
anti
gen
anti
against
gen
produce
Etymology
the term "antigen" is a modern scientific coinage, constructed from classical greek elements to precisely describe its function. the prefix "anti-" carries the sense of 'opposed to' or 'acting against', while the suffix "-gen" derives from the greek verb 'gignesthai', meaning 'to be born' or 'to produce'. literally, an antigen is a substance that 'produces something against' itself—specifically, it stimulates the immune system to generate antibodies. this logical compounding reflects the 20th-century practice of using ancient roots to create precise, internationally understood terminology for medical and biological sciences, where the word elegantly encapsulates the core antagonistic relationship between an invading substance and the body's defensive response.
Analysis
Structure: anti (against) + gen (produce)
"anti-" is a prefix of Greek origin meaning 'against' or 'opposite'. "-gen" is a combining form from Greek '-genēs', meaning 'born of', 'producing', or 'causing'.
Examples
the test screens for a specific antigen associated with the virus.
pollen is a common antigen that triggers hay fever in many people.
vaccines work by introducing a harmless form of an antigen to train the immune system.